package operation;
import java.util.Scanner;
import book.BookList;
import book.Book;
public class DelOperation implements IOPeration {
    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书！");
        //1.找到你要删除的书
        int currentSize = bookList.getUsedSize();
        if(currentSize == 0){
            System.out.println("书架为空，不能删除!");
            return;
        }

        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入书名：");
        String name = scanner.nextLine();

        int index = -1;
        for(int i = 0;i<currentSize;i++){
            Book book1 = bookList.getBook(i);
            if(book1.getName().equals(name)){
                index = i;
                break;
            }
        }
        //2.index != -1  有这本书 开始删除
        if(index == -1){
            System.out.println("没有你要删除的书！");
            return;
        }
        for(int i = index;i<currentSize -1;i++){
            Book book1 = bookList.getBook(i+1);
            bookList.setBooks(i,book1);
        }
        //当书被删掉之后，需要维持usedSize
        bookList.setUsedSize(currentSize-1);

    }
}
